Low viability of cholera toxin-producing vibrio cholerae o1 in the artificial low ionic strength aquatic solution

Subha Sankar Paul, Eizo Takahashi, Goutam Chowdhury, Shin Ichi Miyoshi, Tamaki Mizuno, Asish K. Mukhopadhyay, Shanta Dutta, Keinosuke Okamoto

Research output: Contribution to journalArticlepeer-review

Abstract

It has been well known that Vibrio cholerae inhabit in environmental water. As many patients infected with cholera toxin-producing V. cholerae O1 (toxigenic V. cholerae O1) emerge in Kolkata, India, it has been thought that toxigenic V. cholerae O1 is easily detected in environmental water in Kolkata. However, we could not isolate toxigenic V. cholerae O1 from environmental water in Kolkata, though NAG Vibrio (generic name of V. cholerae non-O1/non-O139) is constantly detected. To clear the reason for the non-isolation of toxigenic V. cholerae O1, we examined the viability of V. cholera O1 and NAG Vibrios in the artificial low ionic strength aquatic solution. We found that the viability of toxigenic V. cholerae O1 in the solution is low, but that of NAG Vibrios is high. Subsequently, we examined the viability of NAG Vibrios possessing cholera toxin gene (ctx) in the same condition and found that the viability of these NAG Vibrios is low. These results indicate that the existence of ctx in V. cholerae affects the viability of V. cholerae in the aquatic solution used in this experiment. We thought that there was closely relation between the low viability of toxigenic V. cholerae O1 in the artificial low ionic strength aquatic solution and the low frequency of isolation of the strain from environmental water.

Original languageEnglish
Pages (from-to)1288-1291
Number of pages4
JournalBiological and Pharmaceutical Bulletin
Volume43
Issue number8
DOIs
Publication statusPublished - 2020

Keywords

  • Aquatic solution
  • Cholera toxin
  • Viability
  • Vibrio cholerae

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science

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